Answers
Answers to Mini-Quizzes
and Labs
Answers to Chapter 1 Mini-Quizzes
Mini-Quiz 1-1
1.
machine
2.
a. procedure-oriented
3.
b. object-oriented
4.
compiler
Mini-Quiz 1-2
1.
sequence, selection, repetition
2.
sequence
3.
algorithm
4.
repetition
5.
repetition
6.
selection
2
Answers
Answers to Mini-Quizzes and Labs
Answers to Chapter 1 Labs
LAb
LA
Ab
b 1-1 stop
top and Analyze
1. sequence and repetition
2. 2100, 315, and 1785
3. Change the first line to repeat for (the first 10 customers buying a TV).
4. Change the second line to enter the original price of the TV and the discount rate.
Then, replace 15% in the third line with the discount rate.
LAb
LA
Ab
b 1-2 Plan and Create
repeat (10 times)
enter the salesperson’s name and sales
if (the sales are greater than 10,000)
calculate the bonus by multiplying the sales by 10%
else
calculate the bonus by multiplying the sales by 5%
end if
display the salesperson’s name and bonus
end repeat
LAb
LA
Ab
b 1-3 Modify
You can use either of the following algorithms. The modifications are shaded
in each.
Algorithm 1
repeat for (each customer buying a TV)
enter the original price of the TV
if (the customer is a store employee)
calculate the discount by multiplying the original price by 25%
else
calculate the discount by multiplying the original price by 15%
end if
calculate the total due by subtracting the discount from the original price
print a bill showing the original price, discount, and total due
end repeat
3
Answers to Chapter 2 Mini-Quizzes
Algorithm 2
repeat for (each customer buying a TV)
enter the original price of the TV
if (the customer is not a store employee)
calculate the discount by multiplying the original price by 15%
else
calculate the discount by multiplying the original price by 25%
end if
calculate the total due by subtracting the discount from the original price
print a bill showing the original price, discount, and total due
end repeat
LAb
LA
Ab
b 1-4 what’s
hat’s Missing?
The missing instruction is shaded.
repeat (3 times)
walk forward one complete step
end repeat
if (Ginger is on the bench)
gently shove Ginger off the bench
end if
repeat (2 times)
turn left 90 degrees
end repeat
sit down on the bench
Answers to Chapter 2 Mini-Quizzes
Mini-Quiz 2-1
1.
Output:
Input:
raise
new salary
current salary
raise percentage
2.
Output:
Input:
average score
midterm score
final score
3.
Output:
10% tip
15% tip
20% tip
customer bill
Input:
4.
Output:
Input:
yearly savings
amount saved per day
number of days in the year
4
Answers
Answers to Mini-Quizzes and Labs
Mini-Quiz 2-2
1.
input/output
2.
rectangular
3.
Input
Processing
Output
current salary
raise percentage
Processing items: none
raise
new salary
4.
Algorithm:
1. enter the current salary and raise percentage
2. calculate the raise by multiplying the
current salary by the raise percentage
3. calculate the new salary by adding the raise
to the current salary
4. display the raise and new salary
Input
Processing
Output
midterm score
final score
Processing items:
sum
average score
Algorithm:
start
enter midterm
score and
final score
sum = midterm
score + final score
average score = sum / 2
display average score
stop
5
Answers to Chapter 2 Labs
Mini-Quiz 2-3
1.
current salary
32600
54700
raise percentage
.05
.02
raise
1630
1094
new salary
34230
55794
midterm score
75
98
final score
83
93
sum
158
191
average score
79
95.5
2.
Answers to Chapter 2 Labs
LAb
LA
Ab
b 2-1 stop
top and Analyze
1.
quantity sold
100
650
item cost
5
2.50
item selling price
8
3.75
price and cost difference profit
3
300
1.25
812.50
The algorithm will display 300 using the first set of input values. It will display
812.50 using the second set of input values.
2.
Input
Processing
Output
quantity sold
item cost
item selling price
Processing items: none
price and cost difference
profit
Input
Processing
Output
quantity sold
item cost
item selling price
Processing items: none
profit
Algorithm:
1. enter the quantity sold, item cost, and item selling price
2. calculate the price and cost difference by subtracting the
item cost from the item selling price
3. calculate the profit by multiplying the price and cost
difference by the quantity sold
4. display the price and cost difference and profit
3.
quantity sold
Algorithm:
1. enter the quantity sold, item cost, and item selling price
2. calculate the profit by subtracting the item cost from
the item selling price, and then multiplying the result by
the quantity sold
3. display the profit
item cost
item selling price
profit
6
Answers
Answers to Mini-Quizzes and Labs
LAb
LA
Ab
b 2-2 Plan and Create
No answer required.
LAb
LA
Ab
b 2-3
Modify
Input
Processing
Output
number of doughnuts ordered
number of muffins ordered
doughnut price
muffin price
Processing items:
doughnut cost
muffin cost
total number of items ordered
total cost
Algorithm:
1. enter the number of doughnuts ordered, number
of muffins ordered, doughnut price, and
muffin price
2. calculate the total number of items ordered by
adding together the number of doughnuts
ordered and number of muffins ordered
3. calculate the doughnut cost by multiplying the
number of doughnuts ordered by the
doughnut price
4 calculate the muffin cost by multiplying the
number of muffins ordered by the muffin price
5. calculate the total cost by adding the
doughnut cost to the muffin cost
6. display the total number of items ordered and
total cost
number of
doughnuts ordered
4
0
doughnut cost
2
0
number of
muffins ordered
2
12
muffin cost
1.10
8.40
doughnut
price
0.50
0.60
total number of
items ordered
6
12
muffin
price
0.55
0.70
total cost
3.10
8.40
7
Answers to Chapter 2 Labs
LAb
LA
Ab
b 2-4
what’s
hat’s Missing?
Input
Processing
Output
shortbread sold
pecan sandies sold
chocolate mint sold
Processing items:
total sold
shortbread contribution
pecan sandies contribution
chocolate mint contribution
Algorithm:
1. enter shortbread sold, pecan sandies sold, and chocolate
mint sold
2. calculate the total sold by adding together shortbread
sold, pecan sandies sold, and chocolate mint sold
3. calculate shortbread contribution by dividing shortbread
sold by total sold, and then multiplying the result by 100
4. calculate pecan sandies contribution by dividing pecan
sandies sold by total sold, and then multiplying the
result by 100
5. calculate chocolate mint contribution by dividing
chocolate mint sold by total sold, and then multiplying
the result by 100
6. display shortbread contribution, pecan sandies
contribution, and chocolate mint contribution
LAb
LA
Ab
b 2-5 Desk-Check
restaurant bill
102.50
56.78
sales tax
5.80
2.18
bill before sales tax
96.70
54.60
10% tip
9.67
5.46
15% tip
14.51
8.19
20% tip
19.34
10.92
LAb
LA
Ab
b 2-6 Debug
first number
33
second number
56
third number
70
sum
159
average
53
8
Answers
Answers to Mini-Quizzes and Labs
Answers to Chapter 3 Mini-Quizzes
Mini-Quiz 3-1
1.
one
2.
a. salesTax
3.
d. TAX_RATE
4.
variables and named constants
Mini-Quiz 3-2
1.
a. True
2.
b. 11011
3.
72, 01001000
4.
d. both a and c
Mini-Quiz 3-3
1.
a. ‘$’
2.
d. all of the above
3.
3
4.
int population = 0;
5.
const double INTEREST_RATE = 0.05;
6.
$5
Answers to Chapter 3 Labs
LAb
LA
Ab
b 3-1 stop
top and Analyze
1. The problem requires five memory locations.
2. The problem requires one named constant for the item cost. A named constant
is appropriate because the item cost will always be $5.45. The remaining four
input, processing, and output items require variables. Variables were chosen for
these items so that their values can vary during runtime.
9
Answers to Chapter 3 Labs
3. int quantitySold = 0;
const double ITEM_COST = 5.45;
double sellingPrice = 0.0;
double difference = 0.0;
double profit = 0.0;
LAb
LA
Ab
b 3-2 Plan and Create
No answer required.
LAb
LA
Ab
b 3-3 Modify
The modifications made to Figures 3-18 and 3-21 are shaded.
Input
Processing
Output
commission rate
sales amount
Processing items: none
commission
Algorithm:
1. enter the commission rate and sales amount
2. calculate the commission by multiplying the
sales amount by the commission rate
3. display the commission
IPO chart information
Input
commission rate
sales amount
C++ instructions
double CommRate = 0.0;
double sales = 0.0;
Processing
none
Output
commission
double commission = 0.0;
LAb
LA
Ab
b 3-4 what’s
hat’s Missing?
The missing statement is shaded.
IPO chart information
Input
height
radius
pi (3.14)
C++ instructions
double height = 0.0;
double radius = 0.0;
const double PI = 3.14;
10
Answers
Answers to Mini-Quizzes and Labs
Processing
none
Output
volume
double volume = 0.0;
LAb
LA
Ab
b 3-5 Desk-Check
Algorithm:
1. enter the height and radius
2. calculate the volume by multiplying the radius by itself, and then
multiplying the result by pi, and then multiplying that result by the height
3. display the volume
height
9
17
radius
6
15
pi
3.14
3.14
volume
1017.36
12010.50
LAb
LA
Ab
b 3-6 Debug
The modifications made to Figure 3-23 are shaded in the C++ instructions column.
IPO chart information
Input
first number
second number
third number
C++ instructions
double first = 0.0;
double second = 0.0;
double third = 0.0;
Processing
sum
double sum = 0.0;
Output
average
Answers to Chapter 4 Mini-Quizzes
Mini-Quiz 4-1
1.
a. cin >> population;
2.
d. cout << quantity;
3.
d. all of the above
4.
<<
double average = 0.0;
11
Answers to Chapter 4 Labs
Mini-Quiz 4-2
1.
totalDue = 2.5 * quantity;
2.
totalDue = 2.5 * static_cast<double>(quantity);
3.
The expression will evaluate to 5.5. It should evaluate to 6. The expression evaluates
incorrectly because dividing the integer 9 by the integer 2 results in the integer 4 rather
than in the double number 4.5. Adding 1.5 to 4 results in the incorrect answer of 5.5.
4.
You can use any of the following expressions. You can also use the static_cast operator to type cast at least one of the integers in the expression.
9.0 / 2.0 + 1.5
9.0 / 2 + 1.5
9 / 2.0 + 1.5
5.
ordered -= 7;
Mini-Quiz 4-3
1.
syntax
2.
source
3.
braces
Answers to Chapter 4 Labs
LAb
LA
Ab
b 4-1 stop
top and Analyze
1. 1. The quantity integer (10) is implicitly promoted to the double
number 10.0.
2. The result of Step 1 (10.0) is multiplied by the double number stored in the
itemCost variable (5.35), giving 53.5.
3. The integer 5 is implicitly promoted to the double number 5.0
4. The result of Step 2 (53.5) is added to the result of Step 3 (5.0), giving 58.5.
5. The result of Step 4 (58.5) is assigned to the amountDue variable. The value is
correct.
2. 1. The total integer (30) is divided by the integer 3, giving 10.
2. The result of Step 1 (10) is assigned to the total variable. The value is correct.
12
Answers
Answers to Mini-Quizzes and Labs
3. 1. The integer 2 is implicitly promoted to the double number 2.0.
2. The result of Step 1 (2.0) is divided into the double number stored in the
store2Sales variable (8325.72), giving 4162.86.
3. The result of Step 2 (4162.86) is added to the double number stored in the
store1Sales variable (5678.43), giving 9841.29.
4. The result of Step 3 is assigned to the avgSales variable. The value is not correct.
To fix the assignment statement, include parentheses around the addition operation,
like this: avgSales = (store1Sales + store2Sales) / 2;
4. 1. The midterm integer (74) is added to the final integer (93), giving 167.
2. The result of Step 1 (167) is divided by 2, giving 83.
3. The result of Step 2 is assigned to the average variable. The value is not correct.
Two ways you can fix the statement are shown here:
average = (midterm + final) / 2.0;
average = static_cast<double>(midterm + final) / 2;
LAb
LA
Ab
b 4-2 Plan and Create
No answer required.
LAb
LA
Ab
b 4-3 Modify
The modifications made to the Lab4-2.cpp file are shaded.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
//Lab4-3.cpp - displays a salesperson's commission
//Created/revised by <your name> on <current date>
#include <iostream>
using namespace std;
int main()
{
//declare variables
double commRate
= 0.0;
double sales
= 0.0;
double commission = 0.0;
//enter input items
cout << "Sales amount: ";
13
Answers to Chapter 4 Labs
16
cin >> sales;
17
cout << "Commission rate (in decimal form): ";
18
cin >> commRate;
19
20
//calculate and display the commission
21
commission = sales * commRate;
22
cout << "Commission: $"
23
<< commission << endl;
24
25
return 0;
26 } //end of main function
LAb
LA
Ab
b 4-4 what’s
hat’s Missing?
//Lab4-4.cpp - displays the volume of a cylinder
//Created/revised by <your name> on <current date>
#include <iostream>
using namespace std;
int main()
{
const double PI
double height
double radius
double volume
=
=
=
=
3.14;
0.0;
0.0;
0.0;
cout << "Height: ";
cin >> height;
cout << "Radius: ";
cin >> radius;
volume = PI * radius * radius * height;
cout << "Volume: " << volume << endl;
return 0;
} //end of main function
LAb
LA
Ab
b 4-5 Desk-Check
num
75
result1
0
1
result2
0
37
result3
0.0
37.5
14
Answers
Answers to Mini-Quizzes and Labs
LAb
LA
Ab
b 4-6 Debug
To debug the program, you need to convert at least one of the items on the right
side of the assignment operator to the double data type. For example, you can use
any of the following:
area = base * height / 2.0;
area = static_cast<double>(base) * height / 2;
area = base * static_cast<double>(height) / 2;
area = static_cast<double>(base) * static_
cast<double>(height) / 2.0;
Answers to Chapter 5 Mini-Quizzes
Mini-Quiz 5-1
1.
end if
2.
b. False
3.
a. diamond
4.
b. single-alternative
5.
a. dual-alternative
Mini-Quiz 5-2
1.
a. braces
2.
d. if (age == 21)
3.
b. if (price >= 12.75)
4.
c. !=
5.
b. >=
Mini-Quiz 5-3
1.
false
2.
true
3.
false
4.
b. if (age >= 30 && age <= 40)
5.
a. if (code == 'R' || code == 'r')
15
Answers to Chapter 5 Labs
Mini-Quiz 5-4
1.
d. cout << fixed << setprecision(2);
2.
c. letter = tolower(letter);
3.
d. 34.650000
Answers to Chapter 5 Labs
LAb
LA
Ab
b 5-1 stop
top and Analyze
1. The 0.2 rate will be assigned to the rate variable when the user enters either
code 1 or code 3. The 0.15 rate will be assigned to the rate variable when the
user enters one of the following codes: 2, 4, and 5.
2. The directive on Line 5 is necessary because the program uses the
setprecision stream manipulator.
3. The literal constants on Line 19 are enclosed in single quotation marks because the
code variable’s data type is char.
4. if (code != '1' && code != '3')
rate = 0.15;
else
rate = 0.2;
//end if
5. You can also write the statement on Line 26 as follows:
sales = sales * (1 + rate);
sales *= (1 + rate);
sales += (sales * rate);
6. To omit the rate variable from the program, you would need to remove the double
rate = 0.0; and sales = sales + sales * rate; statements. You would also
need to change the rate = 0.2; statement to sales = sales + sales * 0.2;, and
change the rate = 0.15; statement to sales = sales + sales * 0.15;.
LAb
LA
Ab
b 5-2 Plan and Create
No answer required.
16
Answers
Answers to Mini-Quizzes and Labs
LAb
LA
Ab
b 5-3 Modify
The changes made to the original program are shaded in the following partial
program.
int main()
{
const double MEMBER_DISCOUNT_RATE = 0.1;
const double NONMEMBER_DISCOUNT_RATE = 0.05;
const double SHIP_CHG1 = 0.99;
const double SHIP_CHG2 = 4.99;
double amtOwed = 0.0;
char member = ' ';
double discount = 0.0;
//enter input items
cout << "Amount owed before any discount and shipping: ";
cin >> amtOwed;
cout << "Premier Club member (Y/N)? ";
cin >> member;
//subtract discount
if (toupper(member) == 'Y')
discount = amtOwed * MEMBER_DISCOUNT_RATE;
else
discount = amtOwed * NONMEMBER_DISCOUNT_RATE;
//end if
amtOwed -= discount;
LAb
LA
Ab
b 5-4 what’s
hat’s Missing?
//Lab5-4.cpp - displays the total due for tickets
//Created/revised by <your name> on <current date>
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
const int TICKET_PRICE = 75;
int tickets = 0;
int total = 0;
cout << "Number of tickets you want to purchase (the maximum
is 10): ";
cin >> tickets;
if (tickets > 0 && tickets < 11)
{
total = tickets * TICKET_PRICE;
cout << fixed << setprecision(0);
cout << "Price: $" << total << endl;
}
else
cout << "Invalid number of tickets." << endl;
//end if
}
return 0;
//end of main function
17
Answers to Chapter 6 Mini-Quizzes
LAb
LA
Ab
b 5-5 Desk-Check
quantity
0
5
0
0
When the user enters the number 0, the condition in the first if statement evaluates to true
and the statement’s true path displays the message “The quantity must be greater than 0.”
Although the correct message already appears on the screen, the computer still evaluates the
second if statement’s condition, which determines whether the quantity is greater than 0.
The second evaluation is unnecessary and makes the code inefficient. You can fix the code by
replacing the first //end if comment and the second if clause with an else clause.
LAb
LA
Ab
b 5-6 Debug
To debug the program, change if (code = '2') to if (code == '2').
Answers to Chapter 6 Mini-Quizzes
Mini-Quiz 6-1
1.
c. in either an outer selection structure’s false path or its true path
2.
1. shoot the basketball
2. if (the basketball did not go through the hoop)
say “Missed it!”
if (the basketball hit the rim)
say “So close”
end if
else
say “I did it!”
if (Maleek was behind the 3-point line)
say “3 points for me”
else
say “2 points for me”
end if
end if
3.
ask the store clerk whether the store accepts your credit card
if (the store accepts your credit card)
pay for your items using your credit card
else
ask the store clerk whether the store accepts your debit card
18
Answers
Answers to Mini-Quizzes and Labs
if (the store accepts your debit card)
pay for your items using your debit card
else
pay for your items using cash
end if
end if
Mini-Quiz 6-2
1.
2.
if (the test score is at least 90)
display “Great score!”
else
if (the test score is at least 70)
display “Good score”
else
display “Retake the test”
end if
end if
F
F
test score
is at least 70
display
“Retake the test”
3.
test score
is at least 90
T
T
display
“Great score!”
display
“Good score”
if (score >= 90)
cout << "Great score!" << endl;
else
if (score >= 70)
cout << "Good score" << endl;
else
cout << "Retake the test" << endl;
//end if
//end if
4.
a. membership status, day of the week
19
Answers to Chapter 6 Labs
Mini-Quiz 6-3
1.
Using a compound condition rather than a nested selection structure
Reversing the decisions in the outer and nested selection structures
Using an unnecessary nested selection structure
Including an unnecessary comparison in a condition
2.
Algorithm A in Figure 6-19 is inefficient because the nested selection structure is
unnecessary. If the first selection structure’s condition evaluates to false, it means
that the basketball did not go through the hoop. Therefore, there is no need for a
nested selection structure that determines whether the basketball did not go through
the hoop.
3.
Algorithm B in Figure 6-19 will not give you the same results as the algorithm shown
in Figure 6-2. Algorithm B has Maleek saying “I did it!” and “3 points for me” even
when the basketball does not go through the hoop.
4.
Algorithm C in Figure 6-19 will give you the same results as the algorithm shown in
Figure 6-2.
Mini-Quiz 6-4
1.
if (score >= 90)
cout << "Great score!" << endl;
else if (score >= 70)
cout << "Good score" << endl;
else if (score >= 0)
cout << "Retake the test" << endl;
else
cout << "Invalid test score" << endl;
//end if
2.
b. case 'B':
3.
break
Answers to Chapter 6 Labs
LAb
LA
Ab
b 6-1 stop
top and Analyze
1. The program will display the number 11.46 when the ID is the number 11.
2. if (id == 1)
price = 50.55;
else
if (id == 2 || id == 9)
price = 12.35;
else
if (id == 5 || id == 7 || id ==11)
price = 11.46;
else
20
Answers
Answers to Mini-Quizzes and Labs
price = -1
//end if
//end if
//end if
3. if (id == 1)
price = 50.55;
else if (id == 2 || id == 9)
price = 12.35;
else if (id == 5 || id == 7 || id == 11)
price = 11.46;
else
price = -1;
//end if
4. switch (id)
{
case 1:
price = 50.55;
break;
case 2:
case 9:
price = 12.35;
break;
case 5:
case 7:
case 11:
price = 11.46;
break;
default:
price = -1;
} //end switch
5. switch (id)
{
case 1:
price = 50.55;
cout << price <<
break;
case 2:
case 9:
price = 12.35;
cout << price <<
break;
case 5:
case 7:
case 11:
price = 11.46;
cout << price <<
break;
default:
cout << "Invalid
} //end switch
endl;
endl;
endl;
ID" << endl;
21
Answers to Chapter 6 Labs
LAb
LA
Ab
b 6-2 Plan and Create
No answer required.
LAb
LA
Ab
b 6-3 Modify
//Lab6-3.cpp - displays the price of a pizza
//Created/revised by <your name> on <current date>
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
char size = ' ';
char coupon = ' ';
double price = 0.0;
cout << "M(edium) or L(arge) pizza? ";
cin >> size;
size = toupper(size);
if (size != 'M' && size != 'L')
cout << "Please enter either M or L." << endl;
else
{
if (size == 'M')
price = 9.99;
else
//large pizza
price = 12.99;
//end if
cout << "$2 coupon (Y/N)? ";
cin >> coupon;
if (toupper(coupon) == 'Y')
price -= 2;
//end if
cout << fixed << setprecision(2);
cout << "Price: $" << price << endl;
} //end if
}
return 0;
//end of main function
22
Answers
Answers to Mini-Quizzes and Labs
LAb
LA
Ab
b 6-4 what’s
hat’s Missing?
//Lab6-4.cpp - displays the price of a ticket
//Created/revised by <your name> on <current date>
#include <iostream>
using namespace std;
int main()
{
int age = 0;
int price = 0;
cout << "Age (years): ";
cin >> age;
}
if (age < 0)
cout << "Invalid age" << endl;
else
{
if (age > 64)
price = 6;
else if (age > 3)
price = 9;
else
price = 0;
//end if
cout << "Price: $" << price << endl;
} //end if
return 0;
//end of main function
LAb
LA
Ab
b 6-5 Desk-Check
number
0
2
4
0
5
10
0
100
50
23
Answers to Chapter 7 Mini-Quizzes
LAb
LA
Ab
b 6-6 Debug
The modifications are shaded in the code.
//Lab6-6.cpp -displays the salary associated with a code
//Valid codes
Salary
//1
$45,000
//2, 5
$33,000
//3, 4
$25,000
//Created/revised by <your name> on <current date>
#include <iostream>
using namespace std;
int main()
{
int code = 0;
cout << "Enter the code (1 through 5): ";
cin >> code;
//display salary
if (code == 1)
cout << "$45,000" << endl;
else if (code == 2 || code == 5)
cout << "$33,000" << endl;
else if (code == 3 || code == 4)
cout << "$25,000" << endl;
else
cout << "Entry error" << endl;
//end if
return 0;
//end of main function
}
Answers to Chapter 7 Mini-Quizzes
Mini-Quiz 7-1
1.
1. print the first page
2. repeat while (there is another page to print)
print the next page
end repeat
say “Done printing”
24
Answers
Answers to Mini-Quizzes and Labs
2.
1. print the first page
2. repeat while (there is another page to print)
if (the next page is not page 3)
print the next page
end if
end repeat
say “Done printing”
3.
1. shoot the basketball
2. repeat while (the basketball did not go through the hoop)
say “Missed it!”
shoot the basketball
end repeat
3. say “I did it!”
Mini-Quiz 7-2
1. while (ordered > 100)
2. while (quantity >= 0)
3. while (inStock > reorder)
4. while (toupper(letter) == 'Y') [You can also use while (tolower(letter)
== 'y') or while (letter == 'Y' || letter == 'y').]
5.
a. –9
Mini-Quiz 7-3
1. b. counter
2. quantity += 10; (or quantity = quantity + 10;)
3. total -= 5; (or total = total - 5; or total += -5; or total = total + -5;)
4. t
otalPurchases += purchases; (or totalPurchases = totalPurchases +
purchases;)
25
Answers to Chapter 7 Labs
Mini-Quiz 7-4
1. while (evenNum < 9)
{
}
cout << evenNum << endl;
(or evenNum = evenNum + 2;)
evenNum += 2;
//end while
2.
a. for (int x = 10; x <= 100; x = x + 10)
3.
d. 110
4.
for (int x = 25; x > 0; x = x – 5) (You can also use x -= 5, x += –5, or
x = x + –5 as the update argument.)
5.
0
6.
for (int num = 2; num < 9; num += 2) (You can also use num = num + 2 as the
update argument.)
Answers to Chapter 7 Labs
LAb
LA
Ab
b 7-1 stop
top and Analyze
1. The program’s counter and accumulator variables are named day and
totalTexts, respectively.
2. The for clause’s condition argument can also be phrased as day <= 7.
3. The for statement’s counter variable is declared at the beginning of the program
because it needs to be used after the for loop ends. More specifically, it needs to
be used by the statement on Line 24, which calculates the average number of text
messages.
4. The average number of text messages is 74.
day
0
1
2
3
4
5
6
7
8
dailyTexts
0
76
80
100
43
68
70
79
5. The program displays 74.
totalTexts
0
76
156
256
299
367
437
516
average
0.0
74.0
26
Answers
Answers to Mini-Quizzes and Labs
6. The build or compile operation was not successful because the compiler does not recognize the day variable used in Line 24. When the for loop ended, that variable was
removed from the computer’s internal memory.
8. The program does not work correctly because it prompts the user to enter the number
of text messages for days from 0 through 7, rather than from 1 through 7. To fix the
program change the day variable’s declaration statement to int day = 1;.
LAb
LA
Ab
b 7-2 Plan and Create
No answer required.
LAb
LA
Ab
b 7-3 Modify
//Lab7-3.cpp - calculates the average number of text
//messages sent each day for 7 days
//Created/revised by <your name> on <current date>
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
int day = 1;
int totalTexts = 0;
int dailyTexts = 0;
double average = 0.0;
while (day < 8)
{
cout << "How many text messages did you send on day "
<< day << "? ";
cin >> dailyTexts;
totalTexts += dailyTexts;
day += 1;
} //end while
}
average = static_cast<double>(totalTexts) / (day - 1);
cout << fixed << setprecision(0);
cout << endl << "You sent approximately "
<< average << " text messages per day." << endl;
return 0;
//end of main function
27
Answers to Chapter 7 Labs
LAb
LA
Ab
b 7-4 what’s
hat’s Missing?
//Lab7-4.cpp - displays the average electric bill
//Created/revised by <your name> on <current date>
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
double bill = 0.0;
double totalBills = 0.0;
double avgBill = 0.0;
int months = 0;
cout << "Bill for month 1: ";
cin >> bill;
while (bill >= 0.0)
{
totalBills += bill;
months += 1;
cout << "Bill for month " << months + 1 << ": ";
cin >> bill;
} //end while
}
if (months > 0)
{
avgBill = totalBills / months;
cout << fixed << setprecision(2);
cout << "Average electric bill for " << months
<< " months: $" << avgBill << endl;
}
else
cout << "No bill amount entered." << endl;
//end if
return 0;
//end of main function
LAb
LA
Ab
b 7-5 Desk-Check
The original code contains an error because it will not display the number 12. To
correct the code, change the for statement’s condition to number <= 12.
First desk-check:
number
2
4
6
8
10
12
Corrected desk-check:
number
2
4
6
8
10
12
14
28
Answers
Answers to Mini-Quizzes and Labs
LAb
LA
Ab
b 7-6 Debug
To debug the program, enter a cin >> price; statement below the cout << "Next
price: "; statement.
Answers to Chapter 8 Mini-Quizzes
Mini-Quiz 8-1
1.
The condition will be evaluated four times. The algorithm will display the numbers 5,
8, and 9, followed by the word Done.
2.
The condition will be evaluated once. The algorithm will display the word Done.
3.
The condition will be evaluated three times. The algorithm will display the numbers 5,
8, and 9, followed by the word Done.
4.
The condition will be evaluated once. The algorithm will display the number 0 followed
by the word Done.
Mini-Quiz 8-2
1.
a. do
2.
d. semicolon
3.
} while (ordered <= inventory);
4.
} while (toupper(letter) == 'Y');
Mini-Quiz 8-3
1.
b. False
2.
b. nested, outer
3.
a. outer, nested
29
Answers to Chapter 8 Labs
Answers to Chapter 8 Labs
LAb
LA
Ab
b 8-1 stop
top and Analyze
1.
The program contains three loops. Two of the loops are nested.
2.
Desk-check:
maxRows
0
3
row
0
1
2
3
space
0
1
2
3
0
1
2
0
1
asterisk
0
1
0
1
2
0
1
2
3
The program will display the following pattern of asterisks:
*
* *
* * *
3. The program displays the pattern of asterisks shown above.
4. The program displays the following pattern of asterisks:
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *
* * * * * * * * *
* * * * * * * * * *
5. //Lab8-1.cpp
//Created/revised by <your name> on <current date>
#include <iostream>
using namespace std;
int main()
{
int maxRows = 0;
int row = 0;
cout << "Maximum number of rows: ";
cin >> maxRows;
while (row < maxRows)
{
for (int space = 0; space < maxRows - row; space += 1)
cout << " ";
//end for
30
Answers
Answers to Mini-Quizzes and Labs
for (int asterisk = 0; asterisk <= row; asterisk += 1)
cout << "* ";
//end for
}
cout << endl;
row += 1;
} //end while
return 0;
//end of main function
LAb
LA
Ab
b 8-2 Plan and Create
No answer required.
LAb
LA
Ab
b 8-3 Modify
//Lab8-3.cpp - displays a person's total
//earnings before retirement at age 65,
//using annual raise rates of 3%, 4%, and 5%
//Created/revised by <your name> on <current date>
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
int age = 0;
int currentSalary = 0;
int yearsToRetire = 0;
double newSalary = 0.0;
double total = 0.0;
double rate = 0.0;
cout << fixed << setprecision(0);
cout << "Current age in years (1 to 64): ";
cin >> age;
if (age < 1 || age > 64)
cout << "Please enter an age from 1 to 64." << endl;
else
{
cout << "Current salary as a whole number: ";
cin >> currentSalary;
cout << endl;
yearsToRetire = 65 - age;
rate = 0.03;
do
{
newSalary = currentSalary;
total = currentSalary;
//year 1 salary
//year 1 salary
31
Answers to Chapter 8 Labs
}
for (int year = 2; year <= yearsToRetire; year += 1)
{
newSalary *= (1 + rate);
total += newSalary;
} //end for
cout << "Total with a " << rate * 100
<< "% annual raise: $" << total << endl;
rate += 0.01;
} while (rate < 0.06);
} //end if
return 0;
//end of main function
LAb
LA
Ab
b 8-4 what’s
hat’s Missing?
//Lab8-4.cpp - displays a pattern of numbers
//Created/revised by <your name> on <current date>
#include <iostream>
using namespace std;
int main()
{
int maxRows = 0;
cout << "How many rows? ";
cin >> maxRows;
}
for (int row = 1; row <= maxRows; row += 1)
{
for (int col = 1; col <= row; col += 1)
cout << col;
//end for
cout << endl;
} //end for
return 0;
//end of main function
LAb
LA
Ab
b 8-5 Desk-Check
Desk-check:
sumX
0
2
6
12
sumY
0
1
4
5
8
9
12
x
2
4
6
8
y
1
3
5
1
3
5
1
3
5
32
Answers
Answers to Mini-Quizzes and Labs
The program will display the following:
sumX value: 12
sumY value: 12
When the outer loop ends, the x variable contains the number 8. When the nested
loop ends, the y variable contains the number 5.
LAb
LA
Ab
b 8-6 Debug
To debug the program, cut the month += 1; statement from the nested loop
and paste it below the cout << endl; statement in the outer loop. Also, change
the totalSales += totalSales + sales; statement to either totalSales =
totalSales + sales; or totalSales += sales;.
Answers to Chapter 9 Mini-Quizzes
Mini-Quiz 9-1
1.
b. sqrt(16.0)
2.
c. 25 + rand() % (50 – 25 + 1)
3.
d. none of the above
4.
a. #include <ctime>
Mini-Quiz 9-2
1.
d. all of the above
2.
a. double getArea()
3.
double getGrossPay(int hours, double rate)
4.
return gross;
33
Answers to Chapter 9 Labs
Mini-Quiz 9-3
1.
b. area = getArea();
2.
c. double getArea();
3.
cout << getArea();
4.
double getGrossPay(int hours, double rate); or double getGrossPay
(int, double);
5.
weekGross = getGrossPay(40, payRate);
Answers to Chapter 9 Labs
LAb
LA
Ab
b 9-1 stop
top and Analyze
1. The statements on Lines 9 and 10 are function prototypes, and they are
necessary because the getArea and getDiameter functions are defined below
the main function.
2. The statement on Line 9 could also be written as follows: double
getArea(double);.
3. Without the outer selection structure, the program will display the following: Diameter: 20.
4. The scope of the choice and radius variables is the main function (Lines 17 through
36). The lifetime is the same as the main function’s lifetime, which means that the
variables will be removed from the computer’s memory when the main function ends.
5. The scope of the rad variable used in the getArea function is the function itself (Lines
40 through 45). Its lifetime is the same as the getArea function’s lifetime, which means
it will be removed from the computer’s memory when the function ends.
6. The scope of the PI constant and the area variable is the getArea function (Lines 43
through 45). Their lifetime is the same as the getArea function’s lifetime, which means
they will be removed from the computer’s memory when the function ends.
7. The scope of the rad variable used in the getDiameter function is the function itself
(Lines 48 through 50). Its lifetime is the same as the getDiameter function’s lifetime,
which means it will be removed from the computer’s memory when the function ends.
9. //Lab9-1.cpp - circle calculations
//Created/revised by <your name> on <current date>
#include <iostream>
#include <cmath>
using namespace std;
//function prototypes
double getArea(double rad);
double getDiameter(double rad);
double getCircumference(double rad);
34
Answers
Answers to Mini-Quizzes and Labs
int main()
{
int choice = 0;
double radius = 0.0;
cout << "1
Circle
cout << "2
Circle
cout << "3
Circle
cout << "Enter your
cin >> choice;
}
area" << endl;
diameter" << endl;
circumference" << endl;
choice (1, 2, or 3): ";
if (choice < 1 || choice > 3)
cout << "Invalid choice" << endl;
else
{
cout << "Radius: ";
cin >> radius;
if (choice == 1)
cout << "Area: " << getArea(radius);
else if (choice == 2)
cout << "Diameter: " << getDiameter(radius);
else
cout << "Circumference: " << getCircumference(radius);
//end if
cout << endl;
} //end if
return 0;
//end of main function
//*****function definitions*****
double getArea(double rad)
{
const double PI = 3.141593;
double area = 0.0;
area = PI * pow(rad, 2);
return area;
} //end getArea function
double getDiameter(double rad)
{
return 2 * rad;
} //end getDiameter function
double getCircumference(double rad)
{
const double PI = 3.141593;
double circumference = 0.0;
circumference = 2 * PI * rad;
return circumference;
} //end getCircumference function
35
Answers to Chapter 9 Labs
LAb
LA
Ab
b 9-2 Plan and Create
No answer required.
LAb
LA
Ab
b 9-3 Modify
//Lab9-3.cpp - displays two monthly car payments
//Created/revised by <your name> on <current date>
#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
//function prototype
double getPayment(int, double, int);
int main()
{
int carPrice = 0;
int rebate = 0;
double creditRate = 0.0;
double dealerRate = 0.0;
int term = 0;
double creditPayment = 0.0;
double dealerPayment = 0.0;
char another = 'Y';
while (another == 'Y')
{
cout << "Car price (after any trade-in): ";
cin >> carPrice;
cout << "Rebate: ";
cin >> rebate;
cout << "Credit union rate: ";
cin >> creditRate;
cout << "Dealer rate: ";
cin >> dealerRate;
cout << "Term in years: ";
cin >> term;
if (creditRate
creditRate
//end if
if (dealerRate
dealerRate
//end if
>= 1)
/= 100;
>= 1)
/= 100;
36
Answers
Answers to Mini-Quizzes and Labs
//call function to calculate payments
creditPayment = getPayment(carPrice - rebate,
creditRate / 12, term * 12);
dealerPayment = getPayment(carPrice,
dealerRate / 12, term * 12);
//display payments
cout << fixed << setprecision(2) << endl;
cout << "Credit union payment: $"
<< creditPayment << endl;
cout << "Dealer payment: $"
<< dealerPayment << endl;
if (creditPayment < dealerPayment)
cout << "Take the rebate and finance through the credit union.";
else if (creditPayment > dealerPayment)
cout << "Don't take the rebate. Finance through the dealer.";
else
cout << "You can finance through the dealer or the credit union.";
//end if
cout << endl;
cout << "Calculate another set of payments (Y/N)?";
cin >> another;
another = toupper(another);
} //end while
}
return 0;
//end of main function
//*****function definitions*****
double getPayment(int prin,
double monthRate,
int months)
{
//calculates and returns a monthly payment
double monthPay = 0.0;
monthPay = prin * monthRate /
(1 - pow(monthRate + 1, -months));
return monthPay;
}
//end of getPayment function
37
Answers to Chapter 9 Labs
LAb
LA
Ab
b 9-4 what’s
hat’s Missing?
//Lab9-4.cpp - displays total due
//Created/revised by <your name> on <current date>
#include <iostream>
#include <iomanip>
using namespace std;
double getSalesTax(double subTotal);
int main()
{
int quantity = 0;
double itemPrice = 0.0;
double totalBeforeTax = 0.0;
double totalDue = 0.0;
cout << "Quantity: ";
cin >> quantity;
cout << "Item price: ";
cin >> itemPrice;
totalBeforeTax = quantity * itemPrice;
totalDue = totalBeforeTax + getSalesTax(totalBeforeTax);
cout << fixed << setprecision(2) << endl;
cout << "Total due: $" << totalDue << endl;
return 0;
} //end of main function
//*****function definitions*****
double getSalesTax(double subtotal)
{
const double TAX_RATE = 0.1;
double tax = 0.0;
tax = subtotal * TAX_RATE;
return tax;
} //end of getSalesTax function
38
Answers
Answers to Mini-Quizzes and Labs
LAb
LA
Ab
b 9-5 DeskDesk-Check
Check
Desk-check:
currentTotal
0
100
116
110
210
291
281
number
0
4
–3
10
9
–5
x
1
2
3
4
5
6
The code will display 281 as the current total.
LAb
LA
Ab
b 9-6
current
100
116
116
110
110
210
210
291
291
281
num
4
–3
10
9
–5
Debug
To debug the program, change the statement that calls the getDepreciation function
to depreciation = getDepreciation(cost, salvage, lifeYears);.
Answers to Chapter 10 Mini-Quizzes
Mini-Quiz 10-1
1.
void
2.
displayTaxes(federalTax, localTax);
3.
void displayTaxes(double fedTax, double stateTax)
4.
b. False
Mini-Quiz 10-2
1.
void calcTaxes(double pay, double &fedTax, double &stateTax)
2.
calcTaxes(gross, federal, state);
3.
void calcTaxes(double pay, double &fedTax, double &stateTax); or void
calcTaxes(double, double &, double &)
4.
b. False
39
Answers to Chapter 10 Labs
Answers to Chapter 10 Labs
LAb
LA
Ab
b 10-1 stop
top and Analyze
1. Lines 10 and 52 indicate whether the variables are passed by value or by reference
to the getArea function.
2. The radius variable is passed by value because the receiving functions need
to know its value but do not need to change its contents. The circleArea and
circleDiameter variables are passed by reference because the receiving functions need to store values (either the area or the diameter) inside the variables.
3. The displayChoices function is a void function because it does not need to return a
value after completing its task.
4. The getArea and getDiameter functions use the variables that are passed by reference
to send information back to the main function.
5. //Lab10-1.cpp - circle calculations
//Created/revised by <your name> on <current date>
#include <iostream>
#include <cmath>
using namespace std;
//function prototypes
void displayChoices();
double getArea(double rad);
void getDiameter(double rad, double &diameter);
int main()
{
int choice = 0;
double radius = 0.0;
double circleArea = 0.0;
double circleDiameter = 0.0;
displayChoices();
cout << "Enter your choice (1 or 2): ";
cin >> choice;
if (choice < 1 || choice > 2)
cout << "Invalid choice" << endl;
else
{
cout << "Radius: ";
cin >> radius;
if (choice == 1)
{
circleArea = getArea(radius);
cout << "Area: " << circleArea;
}
40
Answers
Answers to Mini-Quizzes and Labs
else
{
}
getDiameter(radius, circleDiameter);
cout << "Diameter: " << circleDiameter;
} //end if
cout << endl;
} //end if
return 0;
//end of main function
//*****function definitions*****
void displayChoices()
{
cout << "1
Circle area" << endl;
cout << "2
Circle diameter" << endl;
} //end displayChoices
double getArea(double rad)
{
const double PI = 3.141593;
double area = 0.0;
}
area = PI * pow(rad, 2);
return area;
//end getArea function
void getDiameter(double rad, double &diameter)
{
diameter = 2 * rad;
} //end getDiameter function
LAb
LA
Ab
b 10-2 Plan and Create
No answer required.
LAb
LA
Ab
b 10-3 Modify
//Lab10-3.cpp - displays total owed
//Created/revised by <your name> on <current date>
#include <iostream>
#include <iomanip>
using namespace std;
41
Answers to Chapter 10 Labs
//function prototypes
void displayOptions();
double getRegular(int windows, double price);
double getBoGo(int windows, double price);
int main()
{
int option = 0;
int numOrdered = 0;
double winPrice = 0.0;
double totalOwed = 0.0;
cout << fixed << setprecision(2);
displayOptions();
cout << "Pricing option? ";
cin >> option;
if (option == 1 || option == 2)
{
cout << "Number of windows: ";
cin >> numOrdered;
cout << "Price per window: ";
cin >> winPrice;
if (option == 1)
totalOwed = getRegular(numOrdered, winPrice);
else
totalOwed = getBoGo(numOrdered, winPrice);
//end if
cout << "Total owed-----> $" << totalOwed << endl << endl;
}
else
cout << "Invalid option" << endl;
//end if
}
return 0;
//end of main function
//*****function definitions*****
void displayOptions()
{
cout << "Pricing options:" << endl;
cout << "1
Regular pricing" << endl;
cout << "2
BOGO pricing" << endl;
} //end displayOptions
42
Answers
Answers to Mini-Quizzes and Labs
double getRegular(int windows, double price)
{
double total = 0.0;
total = windows * price;
return total;
} //end getRegular function
double getBoGo(int windows, double price)
{
double total = 0.0;
total = (windows / 2 + windows % 2) * price;
return total;
} //end getBoGo function
LAb
LA
Ab
b 10-4 w
what’s
hat’s Missing?
//Lab10-4.cpp - displays the raise and new salary
//Created/revised by <your name> on <current date>
#include <iostream>
#include <iomanip>
using namespace std;
//function prototypes
void getRaise(double current, double rate, double &increase);
void getNewPay(double current, double increase, double &newPay);
int main()
{
double
double
double
double
currentSalary = 0.0;
raiseRate = 0.0;
raise = 0.0;
newSalary = 0.0;
cout << "Current salary: ";
cin >> currentSalary;
cout << "Raise rate (in decimal form): ";
cin >> raiseRate;
//get the raise and new salary
getRaise(currentSalary, raiseRate, raise);
getNewPay(currentSalary, raise, newSalary);
}
//display the raise and new salary
cout << fixed << setprecision(2);
cout << "Raise: $" << raise << endl;
cout << "New salary: $" << newSalary << endl;
return 0;
//end of main function
43
Answers to Chapter 10 Labs
//*****function definitions*****
void getRaise(double current, double rate, double &increase)
{
increase = current * rate;
}
//end of getRaise function
void getNewPay(double current, double increase, double &newPay)
{
newPay = current + increase;
} //end of getNewPay function
LAb
LA
Ab
b 10-5 Desk-Check
Desk-Check
The names in black indicate variables that belong to the main function. The names
in red indicate variables that belong to the getSquare function. The names in blue
indicate variables that belong to the getCube function. The program will display
“The sum is: 50”.
cubeAnswer
sqAnswer
sum
0
1
2
6
14
23
50
number
1
2
3
4
num
1
2
3
num
1
2
3
LAb
LA
Ab
b 10-6 Debug
To debug the program, change the function prototype to either void assignGrade(int
pointsEarned, char &letter); or void assignGrade(int, char &); and
change the function header to void assignGrade(int pointsEarned, char
&letter). Also change the function call to assignGrade(totalPoints, grade);.
44
Answers
Answers to Mini-Quizzes and Labs
Answers to Chapter 11 Mini-Quizzes
Mini-Quiz 11-1
1.
a. int quantities[20] = {0};
2.
quantities[0]
3.
quantities[19]
4.
quantities[3] = 7;
5.
c. total = getTotal(quantities, 20);
Mini-Quiz 11-2
1.
c. total += orders[2];
2.
c. if (orders[3] > 25)
3.
bonus = sales[0] * 0.15;
4.
c. if (sub >= 0 && sub < 10)
5.
a. while (x < 20)
Mini-Quiz 11-3
1.
if (prices[x] < lowest)
2.
sorting
3.
for (int x = 0; x < 10; x += 1)
orders[x] -= 3;
//end for
Answers to Chapter 11 Labs
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b 11-1 stop
top and Analyze
1. The domestic and international arrays are parallel arrays because the elements in one array are related by their subscripts to the elements in the other
array. For example, the first element in both arrays contains the sales made in
January; the second element contains the February sales, and so on.
2. The domestic[1] element contains 30200.
3. The total company sales made in February can be calculated by adding the contents of
the domestic[1] element to the contents of the international[1] element.
45
Answers to Chapter 11 Labs
4. The highest subscript in the international array is 5.
5. The assignment statement would need to be changed to totalSales += domestic
[x – 1] + international[x – 1];.
6. No answer required.
7. //Lab11-1.cpp - calculates the total sales
//Created/revised by <your name> on <current date>
#include <iostream>
using namespace std;
int main()
{
int domestic[6] = {75000, 30200, 67800,
45000, 60000, 67500};
int international[6] = {40000, 75000, 64000,
32600, 47800, 39000};
int totalDomestic = 0;
int totalInternational = 0;
int totalSales = 0;
for (int x = 0; x < 6; x += 1)
{
totalDomestic += domestic[x];
totalInternational += international[x];
} //end for
totalSales = totalDomestic + totalInternational;
}
//display total domestic sales, total international
//sales, and total sales
cout << "Total domestic sales: $"
<< totalDomestic << endl;
cout << "Total international sales: $"
<< totalInternational << endl;
cout << "Total sales: $" << totalSales << endl;
return 0;
//end of main function
8. //Lab11-1.cpp - calculates the total sales
//Created/revised by <your name> on <current date>
#include <iostream>
using namespace std;
int main()
{
int domestic[6] = {75000, 30200, 67800,
45000, 60000, 67500};
46
Answers
Answers to Mini-Quizzes and Labs
int international[6] = {40000, 75000, 64000,
32600, 47800, 39000};
int monthSales[6] = {0};
int totalDomestic = 0;
int totalInternational = 0;
int totalSales = 0;
for (int x = 0; x < 6; x += 1)
{
totalDomestic += domestic[x];
totalInternational += international[x];
monthSales[x] = domestic[x] + international[x];
} //end for
totalSales = totalDomestic + totalInternational;
//display total domestic sales, total international
//sales, and total sales
cout << "Total domestic sales: $"
<< totalDomestic << endl;
cout << "Total international sales: $"
<< totalInternational << endl;
cout << "Total sales: $" << totalSales << endl << endl;
}
//display total sales made in each month
for (int x = 0; x < 6; x += 1)
{
cout << "Month " << x + 1 << " sales: $"
<< monthSales[x] << endl;
} //end for
return 0;
//end of main function
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b 11-2 Plan and Create
No answer required.
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b 11-3 Modify
//Lab11-3.cpp - stores finish times in an array
//and displays the average and lowest times
//Created/revised by <your name> on <current date>
#include <iostream>
#include <iomanip>
using namespace std;
47
Answers to Chapter 11 Labs
//function prototypes
void getAverage(double times[], int numElements, double &avg);
void getLowest(double times[], int numElements, double &lowest);
int main()
{
double finishTimes[5] = {0.0};
double avgTime = 0.0;
double lowestTime = 0.0;
//enter finish times
for (int x = 0; x < 5; x += 1)
{
cout << "Time for race " << x + 1 << ": ";
cin >> finishTimes[x];
} //end for
getAverage(finishTimes, 5, avgTime);
getLowest(finishTimes, 5, lowestTime);
}
cout << fixed << setprecision(1) << endl;
cout << "Average 5K finish time: " << avgTime << endl;
cout << "Lowest 5K finish time: " << lowestTime << endl;
return 0;
//end of main function
//*****function definitions*****
void getAverage(double times[], int numElements, double &avg)
{
double total = 0.0;
}
for (int x = 0; x < numElements; x += 1)
total += times[x];
//end for
avg = total / numElements;
//end of getAverage function
void getLowest(double times[], int numElements, double &lowest)
{
lowest = times[0];
for (int x = 1; x < numElements; x += 1)
if (times[x] < lowest)
lowest = times[x];
//end if
//end for
} //end of getLowest function
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Answers
Answers to Mini-Quizzes and Labs
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b 11-4 w
what’s
hat’s Missing?
//Lab11-4.cpp - Displays the average stock price
//Created/revised by <your name> on <current date>
#include <iostream>
#include <iomanip>
using namespace std;
//function prototype
double getTotal(double prices[], int numElements);
int main()
{
double stockPrices[10] = {35.6, 37.8, 39, 38.9, 38.9,
37.8, 37.8, 37.8, 39, 39.5};
double total = 0.0;
double average = 0.0;
}
total = getTotal(stockPrices, 10);
average = total / 10;
cout << fixed << setprecision(2);
cout << "Average stock price: $" << average << endl;
return 0;
//end of main function
//*****function definitions*****
double getTotal(double prices[], int numElements)
{
double sumPrices = 0.0;
for (int sub = 0; sub < numElements; sub += 1)
sumPrices += prices[sub];
//end for
return sumPrices;
} //end of getTotal function
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b 11-5 Desk-Check
Desk-Check
Desk-check:
midterms[0]
0.0
90.0
midterms[1]
0.0
88.0
midterms[2]
0.0
77.0
midterms[3]
0.0
85.0
midterms[4]
0.0
45.0
finals[0]
0.0
100.0
finals[1]
0.0
68.0
finals[2]
0.0
75.0
finals[3]
0.0
85.0
finals[4]
0.0
32.0
49
Answers to Chapter 12 Mini-Quizzes
averages[0]
0.0
95.0
X
0
1
2
3
4
5
averages[1]
0.0
78.0
averages[2]
0.0
76.0
averages[3]
0.0
85.0
averages[4]
0.0
38.5
y
0
1
2
3
4
5
The for loop will display the following:
Student 1 average: 95
Student 2 average: 78
Student 3 average: 76
Student 4 average: 85
Student 5 average: 38.5
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b 11-6 Debug
To debug the program, change the condition in the for clause to x < 10. Also change
the increase += quantities[x]; statement in the for loop to quantities[x]
+= increase;.
Answers to Chapter 12 Mini-Quizzes
Mini-Quiz 12-1
1.
a. int quantities[6][3] = {0};
2.
18
3.
quantities[0][0]
4.
quantities[5][2]
5.
quantities[1][0] = 20;
50
Answers
Answers to Mini-Quizzes and Labs
Mini-Quiz 12-2
1.
c. total += purchases[2][1];
2.
c. if (scores[1][2] > 25)
3.
bonus = sales[0][1] * 0.15;
4.
a. if (row >= 0 && row < 10)
Answers to Chapter 12 Labs
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b 12-1 stop
top and Analyze
1. 39000
2. The total company sales made in February can be calculated by adding the
contents of the company[0][1] element to the contents of the company[1][1]
element.
3. The highest row subscript in the company array is 1. The highest column subscript is 5.
4. The January international sales are stored in the company[1][0] element.
5. The assignment statement would need to be changed to companySales +=
company[location][month – 1];.
6. No answer required.
7. //Lab12-1.cpp - calculates the total company sales
//Created/revised by <your name> on <current date>
#include <iostream>
using namespace std;
int main()
{
int company[2][6] = {{75000,
45000,
{40000,
32600,
int companySales = 0;
int domesticSales = 0;
int internationalSales = 0;
30200,
60000,
75000,
47800,
67800,
67500},
64000,
39000}};
for (int month = 0; month < 6; month += 1)
{
domesticSales += company[0][month];
internationalSales += company[1][month];
} //end for
companySales = domesticSales + internationalSales;
51
Answers to Chapter 12 Labs
}
cout << "Domestic sales: $" << domesticSales << endl;
cout << "International sales: $" << internationalSales << endl;
cout << "Company sales: $" << companySales << endl;
return 0;
//end of main function
8. //Lab12-1.cpp - calculates the total company sales
//Created/revised by <your name> on <current date>
#include <iostream>
using namespace std;
int main()
{
int company[2][6] = {{75000,
45000,
{40000,
32600,
int monthSales[6] = { 0 };
int companySales = 0;
int domesticSales = 0;
int internationalSales = 0;
30200,
60000,
75000,
47800,
67800,
67500},
64000,
39000}};
for (int month = 0; month < 6; month += 1)
{
domesticSales += company[0][month];
internationalSales += company[1][month];
monthSales[month] = company[0][month] + company[1][month];
} //end for
companySales = domesticSales + internationalSales;
cout << "Domestic sales: $" << domesticSales << endl;
cout << "International sales: $" << internationalSales << endl;
cout << "Company sales: $" << companySales << endl;
}
for (int x = 0; x < 6; x += 1)
cout << "Month " << x + 1 << " sales: $"
<< monthSales[x] << endl;
//end for
return 0;
//end of main function
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b 12-2 Plan and Create
No answer required.
52
Answers
Answers to Mini-Quizzes and Labs
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b 12-3 Modify
//Lab12-3.cpp - displays the shipping charge
//Created/revised by <your name> on <current date>
#include <iostream>
using namespace std;
int main()
{
int shipCharges[3][2] = {{101, 0},
{51, 10},
{1, 20}};
int numOrdered = 0;
int rowSub = 0;
cout << "Number ordered " <<
"(negative number or 0 to end): ";
cin >> numOrdered;
while (numOrdered > 0 && numOrdered <= 999999)
{
//search array
rowSub = 0;
while (rowSub < 3 && numOrdered < shipCharges[rowSub][0])
rowSub += 1;
//end while
cout << "Shipping charge for a quantity of "
<< numOrdered << " is $"
<< shipCharges[rowSub][1] << endl << endl;
}
cout << "Number ordered " <<
"(negative number or 0 to end): ";
cin >> numOrdered;
}
//end while
return 0;
//end of main function
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hat’s Missing?
//Lab12-4.cpp - Displays the average stock price
//Created/revised by <your name> on <current date>
#include <iostream>
#include <iomanip>
using namespace std;
//function prototype
double getTotal(double prices[2][5]);
53
Answers to Chapter 12 Labs
int main()
{
double stockPrices[2][5] = {{35.6, 37.8, 39, 38.9, 38.9},
{37.8, 37.8, 37.8, 39, 39.5}};
double total = 0.0;
double average = 0.0;
}
total = getTotal(stockPrices);
average = total / 10;
cout << fixed << setprecision(2);
cout << "Average stock price: $" << average << endl;
return 0;
//end of main function
//*****function definitions*****
double getTotal(double prices[2][5])
{
double sumPrices = 0.0;
for (int row = 0; row < 2; row += 1)
for (int col = 0; col < 5; col += 1)
sumPrices += prices[row][col];
//end for
//end for
return sumPrices;
} //end of getTotal function
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b 12-5 Desk-Check
Desk-Check
sales[0][0]
3567.85
sales[0][1]
2589.99
sales[1][0]
3239.67
sales[1][1]
2785.55
sales[2][0]
1530.5
sales[2][1]
1445.8
total
0.0
3567.85
6157.84
9397.51
12183.06
13713.56
15159.36
store
0
1
2
3
book
0
1
2
0
1
2
0
1
2
54
Answers
Answers to Mini-Quizzes and Labs
LAb
LA
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b 12-6 Debug
To debug the program, change the numbers[row][0] = counter * counter;
statement in the first for loop to numbers[row][1] = counter * counter;, and
then enter the counter += 1; (or counter = counter + 1;) statement below the
numbers[row][1] = counter * counter; statement.
Answers to Chapter 13 Mini-Quizzes
Mini-Quiz 13-1
1.
c. const string CITY = "Fort Knox";
2.
b. string state = "";
3.
a. getline(cin, streetAddress, '\n');
4.
c. cin.ignore(10, '\n');
Mini-Quiz 13-2
1.
a. while (employee.length() > 20)
2.
if (code.length() == 7)
3.
d. both a and b
4.
cout << college.substr(college.length() – 1);
Mini-Quiz 13-3
1.
a. location = cityState.find(",", 0);
2.
13
3.
d. all of the above
Mini-Quiz 13-4
1.
d. none of the above
2.
a. sentence = sentence + temp.assign(4, '!');
3.
b. areaCode = "(" + areaCode + ")";
55
Answers to Chapter 13 Labs
Answers to Chapter 13 Labs
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b 13-1 stop
top and Analyze
1. The purpose of the loop on Lines 20 through 33 is to access each character in
the sales variable, one character at a time, in order to count the number of
number of numbers, periods, and other characters.
2. The statement on Line 22 assigns the current character from the sales variable
to the currentChar variable.
3. The selection structure on Lines 35 through 39 determines whether the sales amount
entered by the user is either valid or invalid. An invalid sales amount is one that either
contains more than one period or contains at least one character that is either not a
number and not a period.
4. The statement on Line 32 allows the program to access the next character in the sales
variable.
5. No answer required.
6. //Lab13-1.cpp
//Created/revised by <your name> on <current date>
#include <iostream>
#include <string>
using namespace std;
int main()
{
string sales = "";
string currentChar = "";
string otherChars = "";
int numNumbers = 0;
int numPeriods = 0;
int numOtherChars = 0;
cout << "Sales amount: ";
getline(cin, sales);
for (int sub = 0; sub < sales.length(); sub += 1)
{
currentChar = sales.substr(sub, 1);
if (currentChar == ".")
numPeriods += 1;
else
if (currentChar < "0" || currentChar > "9")
{
numOtherChars += 1;
otherChars += currentChar;
}
else
56
Answers
Answers to Mini-Quizzes and Labs
}
numNumbers += 1;
//end if
//end if
//end for
if (numPeriods > 1 || numOtherChars > 0)
cout << "Invalid sales amount" << endl;
else
cout << "Valid sales amount" << endl;
//end if
cout << "Numbers: " << numNumbers << endl;
cout << "Periods: " << numPeriods << endl;
cout << numOtherChars << " other characters: "
<< otherChars << endl;
}
return 0;
//end of main function
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b 13-2 Plan and Create
No answer required.
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b 13-3 Modify
//Lab13-3.cpp - Guess the Word game
//Created/revised by <your name> on <current date>
#include <iostream>
#include <string>
//#include <cstdlib>
using namespace std;
int main()
{
string origWord = "";
string letter = "";
char dashReplaced = 'N';
char gameOver = 'N';
int numIncorrect = 0;
string displayWord = "-----";
int numChars = 0;
//get original word
cout << "Enter a word in uppercase: ";
getline(cin, origWord);
57
Answers to Chapter 13 Labs
numChars = origWord.length();
displayWord.assign(numChars, '-');
system("cls");
//clear the screen
//start guessing
cout << "Guess this word: " <<
displayWord << endl;
while (gameOver == 'N')
{
cout << "Enter an uppercase letter: ";
cin >> letter;
//search for the letter in the original word
for (int x = 0; x < numChars; x += 1)
{
//if the current character matches
//the letter, replace the corresponding
//dash in the displayWord variable and then
//set the dashReplaced variable to 'Y'
if (origWord.substr(x, 1) == letter)
{
displayWord.replace(x, 1, letter);
dashReplaced = 'Y';
} //end if
} //end for
//if a dash was replaced, check whether the
//displayWord variable contains another dash
if (dashReplaced == 'Y')
{
//if the displayWord variable does not
//contain any dashes, the game is over
if (displayWord.find("-", 0) == -1)
{
gameOver = 'Y';
cout << endl << "Yes, the word is "
<< origWord << endl;
cout << "Great guessing!" << endl;
}
else //otherwise, continue guessing
{
cout << endl << "Guess this word: "
<< displayWord << endl;
dashReplaced = 'N';
} //end if
}
else //processed when dashReplaced contains 'N'
{
//add 1 to the number of incorrect guesses
numIncorrect += 1;
//if the number of incorrect guesses is 10,
58
Answers
Answers to Mini-Quizzes and Labs
}
//the game is over
if (numIncorrect == 10)
{
gameOver = 'Y';
cout << endl << "Sorry, the word is "
<< origWord << endl;
} //end if
} //end if
} //end while
return 0;
//end of main function
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b 13-4 w
what’s
hat’s Missing?
//Lab13-4.cpp - displays a comma (if necessary) in the output
//Created/revised by <your name> on <current date>
#include <iostream>
#include <string>
using namespace std;
int main()
{
string population = "";
int highSub = 0;
cout << "Enter the population: ";
cin >> population;
highSub = population.length() - 1;
while (highSub >= 3)
{
population.insert(highSub - 2, ",");
highSub -= 3;
} //end while
}
cout << population << endl;
return 0;
//end of main function
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b 13-5 Desk-Check
Desk-Check
Desk-check:
message
vexprealjik
vexprealk
subMessage1
subMessage2
vexprea
!!!!!
59
Answers to Chapter 14 Mini-Quizzes
vexpreadalk
vexgrea
day!!!!!
vexpreaday
vegrea
Haveagreatday!!!!!
veagrea
Veagreat
Have agreatday!!!!!
Have a greatday!!!!!
Haveagreat
Have a great day!!!!!
The code will display the following: Message: Have a great day!!!!!
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b 13-6 Debug
To debug the program, change the cout << message.substr(x) << endl; statement in the for loop to cout << message.substr(x, 1) << endl;.
Answers to Chapter 14 Mini-Quizzes
Mini-Quiz 14-1
1.
b. #include <fstream>
2.
d. ios::in
3.
the Boolean value false
4.
ofstream outAlbums;
5.
c. outAlbums.open("mine.txt", ios::app);
Mini-Quiz 14-2
1.
c. outInv << quantity << endl;
2.
d. outFile << score1 << '#' << score2 << endl;
3.
d. inInv >> number;
Mini-Quiz 14-3
1.
c. while (!inInv.eof())
2.
the Boolean value false
3.
outInv.close();
60
Answers
Answers to Mini-Quizzes and Labs
Answers to Chapter 14 Labs
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b 14-1 stop
top and Analyze
1. The instruction on Line 5 is necessary because the program uses the cin and
cout objects. The instruction on Line 6 is necessary because the program uses
the string class. The instruction on Line 7 is necessary because the program
uses the ofstream class.
2. Each record contains two fields: the movie title and the year the movie was released.
3. The movies.txt file will contain only the two records written during the second run of
the program. This is because the program opens the movies.txt file for output, which
means the file’s contents will be erased each time the program is run.
4. To save the previous records, you need to open the file for append. You do this by
changing the mode in the open function in Line 17 to ios::app.
5. if (outFile.is_open() == true)
6. The purpose of the # character is to separate the movie title field from the year released
field in each record.
7. The statement in Line 32 closes the output file. Neglecting to close a file can result in a
loss of data.
8. No answer required.
9. No answer required.
10. No answer required.
11. Change the outFile.open("movies.txt", ios::out); statement in Line 17 to
outFile.open("movies.txt", ios::app);.
12. No answer required.
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b 14-2 Plan and Create
No answer required.
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b 14-3 Modify
//Lab14-3.cpp - saves records to a sequential access
//file and also calculates and displays the total
//of the sales amounts stored in the file
//Displays the records and the average sales amount
//Created/revised by <your name> on <current date>
61
Answers to Chapter 14 Labs
#include <iostream>
#include <string>
#include <fstream>
using namespace std;
//function prototypes
int getChoice();
void addRecords();
void displayRecords();
void displayTotal();
void displayAvg();
int main()
{
int choice = 0;
do
{
//get user's menu choice
choice = getChoice();
if (choice == 1)
addRecords();
else if (choice == 2)
displayRecords();
else if (choice == 3)
displayTotal();
else if (choice == 4)
displayAvg();
//end if
}
while (choice != 5);
return 0;
}
//end of main function
//*****function definitions*****
int getChoice()
{
//displays menu and returns choice
int menuChoice = 0;
cout << endl << "Menu Options" << endl;
cout << "1 Add Records" << endl;
cout << "2 Display Records" << endl;
cout << "3 Display Total Sales" << endl;
cout << "4 Display Average Sales" << endl;
cout << "5 Exit" << endl;
cout << "Choice (1 through 5)? ";
cin >> menuChoice;
cin.ignore(100, '\n');
cout << endl;
return menuChoice;
}
//end of getChoice function
62
Answers
Answers to Mini-Quizzes and Labs
void addRecords()
{
//saves records to a sequential access file
string name = "";
int sales = 0;
ofstream outFile;
//open file for append
outFile.open("sales.txt", ios::app);
//if the open was successful, get the
//salesperson's name and sales amount and
//then write the information to the file;
//otherwise, display an error message
if (outFile.is_open())
{
cout << "Salesperson's name (X to stop): ";
getline(cin, name);
while (name != "X" && name != "x")
{
cout << "Sales: ";
cin >> sales;
cin.ignore(100, '\n');
outFile << name << '#'
<< sales << endl;
cout << "Salesperson's name "
<< "(X to stop): ";
getline(cin, name);
} //end while
outFile.close();
}
else
}
cout << "sales.txt file could not be opened"
<< endl;
//end if
//end of addRecords function
void displayRecords()
{
//displays the contents of the sales.txt file
string name = "";
int sales = 0;
ifstream inFile;
//open file for input
inFile.open("sales.txt");
//if the open was successful, read a
//record and then display the record
//otherwise, display an error message
if (inFile.is_open())
63
Answers to Chapter 14 Labs
{
getline(inFile, name, '#');
inFile >> sales;
inFile.ignore();
while (!inFile.eof())
{
cout << name << "
$" << sales << endl;
getline(inFile, name, '#');
inFile >> sales;
inFile.ignore();
} //end while
inFile.close();
}
else
cout << "sales.txt file could not be opened." << endl;
//end if
}
//end of displayRecords function
void displayTotal()
{
//calculates and displays the total sales
string name = "";
int sales = 0;
int total = 0;
ifstream inFile;
//open file for input
inFile.open("sales.txt");
//if the open was successful, read the
//salesperson's name and sales amount, then add
//the sales amount to the accumulator, and then
//display the accumulator; otherwise, display
//an error message
if (inFile.is_open())
{
getline(inFile, name, '#');
inFile >> sales;
inFile.ignore();
while (!inFile.eof())
{
total += sales;
getline(inFile, name, '#');
inFile >> sales;
inFile.ignore();
} //end while
inFile.close();
cout << "Total sales $" << total
<< endl << endl;
64
Answers
Answers to Mini-Quizzes and Labs
}
else
}
cout << "sales.txt file could not be opened"
<< endl;
//end if
//end of displayTotal function
void displayAvg()
{
//calculates and displays the average sales
string name = "";
int sales = 0;
int totalSales = 0;
int numSales = 0;
double avgSales = 0.0;
ifstream inFile;
//open file for input
inFile.open("sales.txt");
//if the open was successful, read the
//salesperson's name and sales amount, then add
//the sales amount to the accumulator and add 1
//to the counter; otherwise, display an error message
if (inFile.is_open())
{
getline(inFile, name, '#');
inFile >> sales;
inFile.ignore();
while (!inFile.eof())
{
totalSales += sales;
numSales += 1;
getline(inFile, name, '#');
inFile >> sales;
inFile.ignore();
} //end while
inFile.close();
//calculate and display the average sales
avgSales =
static_cast<double>(totalSales) / numSales;
cout << "Average sales $" << avgSales
<< endl << endl;
}
else
}
cout << "sales.txt file could not be opened." << endl;
//end if
//end of displayAvg function
65
Answers to Chapter 14 Labs
LAb
LA
Ab
b 14-4 what’s
what’s Missing?
//Lab14-4.cpp - saves records to and reads records from a file
//Created/revised by <your name> on <current date>
#include <iostream>
#include <string>
#include <fstream>
using namespace std;
int main()
{
string firstName = "";
string lastName = "";
ifstream inFile;
ofstream outFile;
outFile.open("Lab14-4.txt", ios::out);
for (int num = 1; num < 6; num += 1)
{
cout << "First name: ";
cin >> firstName;
cout << "Last name: ";
cin >> lastName;
outFile << firstName << '#' << lastName << endl;
} //end for
outFile.close();
}
inFile.open("Lab14-4.txt", ios::in);
if (inFile.is_open())
{
for (int num = 1; num < 6; num += 1)
{
getline(inFile, firstName, '#');
getline(inFile, lastName, '\n');
cout << lastName << ", " << firstName << endl;
} //end for
inFile.close();
}
else
cout << "Can't locate the Lab14-4.txt file.";
//end if
return 0;
//end of main function
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Answers
Answers to Mini-Quizzes and Labs
LAb
LA
Ab
b 14-5 Desk- Check
Desk-check:
store1Sales
0
15400
12345
18450
16750
store2Sales
0
23600
25350
30900
31000
store1Total
0
15400
27745
46195
62945
store2Total
0
23600
48950
79850
110850
The code will display the following:
Store 1’s total sales: $62945
Store 2’s total sales: $110850
LAb
LA
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b 14-6
Debug
To debug the program, add the cin.ignore(100, '\n'); statement below the
cin >> num2; statement.
Answers to Chapter 15 Mini-Quizzes
Mini-Quiz 15-1
1.
object-oriented programming
2.
b. False
3.
b. an instance of the class
4.
b. behaviors
Mini-Quiz 15-2
1.
b. False
2.
declaration, implementation
3.
d. variable declarations
4.
a. True
5.
Check payCheck;
6.
a.
paycheck.getCheck()
67
Answers to Chapter 15 Labs
Mini-Quiz 15-3
1.
scope resolution operator
2.
Item();
3.
Item::Item()
{
}
code = ' ';
price = 0;
//end of default constructor
Mini-Quiz 15-4
1.
signature
2.
Item(int);
3.
overloaded
Answers to Chapter 15 Labs
LAb
LA
Ab
b 15-1 stop
top and Analyze
1. The names of the private data members are id and price.
2. The name of the default constructor is Item. The constructor’s purpose is to
initialize the private variables in the class.
3. The setData method assigns the program values to the private variables in the class.
4. The getIncreasedPrice method calculates and returns the new price of the item.
5. The code on Line 36 determines whether the value stored in the rate variable is
greater than 1.0, which indicates that the rate was entered as an integer rather than
as a decimal number. (For example, the user entered 15 rather than .15 as the rate.)
The code on Line 37 converts the integer to its decimal equivalent by dividing the
integer by 100.
6. The computer.setData(computerId, computerPrice); statement is missing from
Line 69.
7. The << computer.getIncreasedPrice(incRate) code is missing from Line 74.
68
Answers
Answers to Mini-Quizzes and Labs
LAb
LA
Ab
b 15-2 Plan and Create
No answer required.
LAb
LA
Ab
b 15-3 Modify
In the Lab15-3.cpp file, change double lawnLength = 0.0; to int lawnLength
= 0;. Also change double lawnWidth = 0.0; to int lawnWidth = 0;. In the
Lab15-3 Rectangle.h file, add the void setDimensions(int, int); prototype
below the existing setDimensions prototype. Also add the following setDimensions
function:
void Rectangle::setDimensions(int len, int wid)
{
//assigns dimensions to private data members
if (len > 0 && wid > 0)
{
length = len);
width = wid;
} //end if
} //end of setDimensions method
LAb
LA
Ab
b 15-4 w
what’s
hat’s Missing?
//Parallelogram.h
//Created/revised by <your name> on <current date>
//declaration section
class Parallelogram
{
public:
Parallelogram();
double calcArea(double, double);
private:
double length;
double height;
};
//implementation section
Parallelogram::Parallelogram()
{
length = 0.0;
height = 0.0;
} //end of default constructor
69
Answers to Chapter 15 Labs
double Parallelogram::calcArea(double l, double h)
{
double area = 0.0;
}
if (l >= 0.0 && h >= 0.0)
area = l * h;
else
area = -1;
//end if
return area;
//end of calcArea method
//Lab15-4.cpp - displays the area of a parallelogram in square yards
//Created/revised by <your name> on <current date>
#include <iostream>
#include <iomanip>
#include "Parallelogram.h"
using namespace std;
int main()
{
Parallelogram parkingLot;
double lotLength = 0.0;
double lotHeight = 0.0;
double lotArea = 0.0;
cout << "Length (in feet): ";
cin >> lotLength;
cout << "Height (in feet): ";
cin >> lotHeight;
}
lotArea = parkingLot.calcArea(lotLength, lotHeight) / 9;
cout << fixed << setprecision(2) << endl;
cout << "Square yards: " << lotArea << endl;
return 0;
//end of main function
LAb
LA
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b 15-5 Desk-Check
Desk-Check
Desk-check:
BONUS_RATE
0.05
name
Carla Rensen
X
dollars
0.0
12456.75
bonus
0.0
622.84
70
Answers
Answers to Mini-Quizzes and Labs
dollarAmt.sales
0.0
12456.75
s
12456.75
r
0.05
The code will display the following: Carla Rensen bonus: $622.84
LAb
LA
Ab
b 15-6 Debug
To debug the program, enter the #include "Lab15-6 Inventory.h" directive in
the Lab15-6.cpp file. Also change the if clause in the setItem method in the Lab15-6
Inventory.h file to if (num > 0).